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## Search for structure in the $B_s^0\pi^\pm$ invariant mass spectrum

Physical Review Letters. 2016. Vol. 117. No. 15.
Borisyak M. A., Derkach D., Likhomanenko T., Rogozhnikov A., Ustyuzhanin A.

The B0sπ± invariant mass distribution is investigated in order to search for possible exotic meson states. The analysis is based on a data sample recorded with the LHCb detector corresponding to 3 fb−1 of pp collision data at s√=7 and 8 TeV. No significant excess is found, and upper limits are set on the production rate of the claimed X(5568) state within the LHCb acceptance. Upper limits are also set as a function of the mass and width of a possible exotic meson decaying to the B0sπ± final state. The same limits also apply to a possible exotic meson decaying through the chain B∗0sπ±, B∗0s→B0sγ where the photon is excluded from the reconstructed decays.